Trace element geochemistry of the Highland Valley and Guichon Creek Batholith in relation to porphyry copper mineralization

Olade, M. A.; Fletcher, W.K.

doi:10.2113/gsecongeo.71.4.733

Cited by 27 publications

(11 citation statements)

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“…Boron is reported as only a trace component in most published analyses of fumarolic gases. A notable enrichment of boron has been repolred in association with some porphyry copper deposits (Olade and Fletcher 1976). In hot springs with probable volcanic affinities, such as in New Zealand, boron ranges from 4 to 88 ppm, dving B/CI ratios of 0.01 to 0.06 (Ellis 1961).…”

Section: Igneous Rocks and Fumarolic Gases Of Igneousmentioning

confidence: 99%

Tourmaline concentrations in Proterozoic sediments of the southern Cordillera of Canada and their economic significance

Ethier¹,

Campbell²

1977

Can. J. Earth Sci.

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Local concentrations of tourmaline occur in the lower Proterozoic (Helikian) Aldridge Formation of southeastern British Columbia, in some places in association with stratiform lead-zinc mineralization as at the Sullivan, Stemwinder, and North Star orebodies. The amount of boron in the rock is as much as two orders of magnitude above average levels reported for the Aldridge Formation or other similar types of sedimentary rocks. The concentrations are not detrital, but are caused by an anomalously high boron level, in a local area, at the time of sedimentation. The appearance of tourmaline within rip-up clasts, and in laminae within pebbles, is evidence of syngenetic introduction of boron.Three populations of tourmalines, on the basis of composition as determined by microprobe analyses, are described from the area:(1) A Proterozoic stock intruding the Aldridge Formation contains abundant schorl.(2) A tourmaline intermediate in composition between dravite and schorl is typical of Aldridge metasediments. Texturally this type occurs as (a) fine felted aggregates in the footwall of the Sullivan orebody, (b) disseminated through waste beds, and (c) in local concentrations removed from the Sullivan orebody.(3) Coarse-grained recrystallized tourmaline associated with the Sullivan ore is magnesiumrich. Recrystallization is erratic, and is probably related to uneven heat flow during metamorphism and to differences in bulk composition.The economic importance of tourmaline concentrations in the Aldridge Formation is their association in both space and time with stratiform sulfides.Des concentrations locales de tourmaline se rencontrent dans la formation d'Aldridge, datant du Proterozoique inferieur (Helikien), au sud-est de la Colombie-Britannique, assocites en certains endroits a des gisements stratiformes de mineralisation plomb-zinc comme les gites de Sullivan, de Stemwinder et de North Star. La teneur en bore de la roche atteint jusqu'a deux ordres de grandeur de plus au-dessus des teneurs moyennes rapportees pour la formation d' Aldridge ou d'autres types de roches ddimentaires semblables. Les concentrations ne sont pas dktritiques mais ont et6 causees par une teneur en bore anormalement elevke, localement, au moment de la sedimentation. L'apparition de tourmaline dans des galets fendus et en lamelles dans des cailloux est une preuve de l'introduction syngenetique de bore.On decrit dans cette region trois populations de tourmalines, en se basant sur leur composition telle que determinee par analyse a la microsonde:(1) Un stock proterozoique qui penetre la formation d'Aldridge contient de la shorlite en abondance.(2) Une tourmaline de composition intermediaire entre la dravite et la schorlite est typique des metasediments d'Aldridge. La texture de cette tourmaline se presente (a) sous forme d'agrkgats fins feutres dans le mur du gisement de Sullivan, (b) disseminee a travers les lits de roche sterile et (c) sous forme de concentrations locales eloignees du gisement de Sullivan.(3) Une tourmaline recristallisee agrain gros...

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Section: Igneous Rocks and Fumarolic Gases Of Igneousmentioning

confidence: 99%

Tourmaline concentrations in Proterozoic sediments of the southern Cordillera of Canada and their economic significance

Ethier¹,

Campbell²

1977

Can. J. Earth Sci.

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“…There is, nonetheless, a significant overlap in this ratio between known productive and nonproductive intrusions. Other major elements and selected trace elements (mainly Rb, Sr, and the transition metals) (Olade andFletcher, 1975, 1976;Oyarzun, 1975;Armbrus et al, 1977;Chaffee, 1976) have provided useful means of defining orebodies on a mine scale, but their applicability on a regional scale has not yet been tested.…”

Section: Introduction the Andes Of Central And Northern Chile Containmentioning

confidence: 99%

Discrimination of productive and nonproductive porphyritic intrusions in the Chilean Andes

Baldwin¹,

Pearce²

1982

Economic Geology

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A geochemical comparison between productive intrusions (those associated with mineralization) and nonproductive intrusions (those unrelated to mineralization) has been made on the basis of over 100 fresh granitoid rocks from the Chilean porphyry copper belt. The study was carried out on the scale of a mining district (El Salvador-Potrerillos), then on the scale of a single traverse (El Salvador-Chilean coast), and finally on the scale of the Andes itself. The productive intrusions are best characterized by large negative anomalies in Y, Mn, Th, and the heavy rare earth elements. A discriminant diagram of Y against MnO is recommended for predicting whether an apparently fresh intrusion has associated peripheral mineralization.The low values of Y and Mn in productive intrusions can be partly explained by the early crystallization of Y-and Mn-rich hydrous phases such as hornblende and by the loss of Mnrich fluids from the magma. The same elements make useful discriminants in other porphyry copper provinces, although the exact position of the discriminant boundary varies from island arcs through continental margin to continental settings.

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“…8), the biotized and sericitized trachybasalts are well separated from those of propylitic and fresh volcanic rocks. This exploration guide is somehow similar to K 2 O/Na 2 O ratio proposed by Boyle (1974) and Olade and Fletcher (1976).…”

Section: Geochemical Discrimination Diagrams; a Possible Exploratimentioning

confidence: 57%

“…Sequential wallrock alteration and geochemical anomalies of mobile elements in volcanic rocks around porphyry copper deposits are more widespread than the mineralized areas and thus become a possible indication of the deposits (Boyle, 1974; Olade & Fletcher, 1976; Hedenquist & Richards, 1998; Watanabe & Hedenquist, 2001; Sillitoe & Perello, 2005; Seedorff et al ., 2005). Understanding of the geochemical discrimination between altered and fresh volcanic rocks in porphyry copper deposits is essential to mineral exploration, regional resource appraisal, and metallogenic studies, yet diagnostic criteria for prospecting and predicting mineralization are scarce (Helgeson, 1970; Hollister, 1974; Warren et al ., 1974; Kesler et al ., 1975; Chaffee, 1976; Olade & Fletcher, 1976; Armbrus et al ., 1977; Mason & Feiss, 1979; Baldwin & Pearce, 1982). The previous discrimination attempts for exploration have used bar graphs and a Y–MnO diagram in both intrusive and volcanic rocks (Baldwin & Pearce, 1982).…”

Section: Introductionmentioning

confidence: 99%

Alteration Geochemistry of Volcanic Rocks around Sarcheshmeh Porphyry Copper Deposit, Rafsanjan, Kerman, Iran: Implications for Regional Exploration

Aftabi

Atapour

2010

Resource Geology

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To discriminate the mineral potentiality of the trachybasalt around the Miocene Sarcheshmeh porphyry copper deposit, petrogeochemical characteristics of more than 45 samples of the volcanic rocks were studied. Sarcheshmeh is one of the world's largest Miocene porphyry copper deposits in a continental arc setting and contains about 1200 million tonnes of ores with an average grade of 1.2 percent copper, 0.03 percent molybdenum, 3.9 g/t Ag and 0.11 g/t Au. The biotized and sericitized trachybasalts around the Sarcheshmeh deposit are associated with chalcopyrite, pyrite and molybdenite and and are enriched in Cu (>3108 ppm), K 2O (>4.2%), Rb (>155 ppm) and MgO (>2.9%), but depleted in yttrium (<11 ppm), MnO (<0.06%), CaO (<0.6%), Na 2O (<0.33%), Sr (<107 ppm), and Ba (<181 ppm). The propylitized trachybasalts are enriched in CaO (>9.1%), Na2O (>3.2%), MnO (>0.24%), Y (>18.2 ppm), and Ba (>323 ppm). The results demonstrate that the diagrams of loss on ignition -Cu, Cu -Y, K2O/K2O + Na2O + CaO -Cu and Y -MnO may be used as an exploration guide for undiscovered porphyry copper mineralization in the Central Iranian volcano-plutonic copper belt.

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Trace element geochemistry of the Highland Valley and Guichon Creek Batholith in relation to porphyry copper mineralization

Cited by 27 publications

References 0 publications

Tourmaline concentrations in Proterozoic sediments of the southern Cordillera of Canada and their economic significance

Tourmaline concentrations in Proterozoic sediments of the southern Cordillera of Canada and their economic significance

Discrimination of productive and nonproductive porphyritic intrusions in the Chilean Andes

Alteration Geochemistry of Volcanic Rocks around Sarcheshmeh Porphyry Copper Deposit, Rafsanjan, Kerman, Iran: Implications for Regional Exploration

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